QSpacerItem在布局中的用法示例

来源：互联网发布：python自动化性能测试编辑：程序博客网时间：2024/06/15 10:24
需要实现的部件显示效果如下：
构建方法如上右图，实现代码：
#include <QApplication>#include <QWidget>#include <QPushButton>#include <QBoxLayout>int main(int argc, char *argv[]){    QApplication a(argc, argv);        QWidget w;        QPushButton btn1("btn1", &w);        QPushButton btn2("btn2", &w);        QPushButton btn3("btn3", &w);        QPushButton btn4("btn4", &w);        QPushButton btn5("btn5", &w);        btn1.setFixedSize(60, 60); //大        btn2.setFixedSize(40, 40); //小        btn3.setFixedSize(40, 40);        btn4.setFixedSize(40, 40);        btn5.setFixedSize(40, 40);        /*        首先把vLayout1 : vSpacer1 btn1看成纵一组        再把vLayout2 : vSpacer2 hLayout1(btn2btn3btn4btn5) vSpacer3看成纵一组（先把btn2btn3btn4btn5看成一横组）        最后把hLayout : vLayout1 vLayout2 hSpacer1看成横一组        */        QHBoxLayout* hLayout = new QHBoxLayout();        QVBoxLayout* vLayout1 = new QVBoxLayout();        QHBoxLayout* hLayout1 = new QHBoxLayout();        QVBoxLayout* vLayout2 = new QVBoxLayout();        QSpacerItem* vSpacer1 = new QSpacerItem(20, 20, QSizePolicy::Minimum, QSizePolicy::Expanding);        QSpacerItem* vSpacer2 = new QSpacerItem(20, 20, QSizePolicy::Minimum, QSizePolicy::Expanding);        QSpacerItem* vSpacer3 = new QSpacerItem(20, 5, QSizePolicy::Minimum, QSizePolicy::Fixed);        QSpacerItem* hSpacer1 = new QSpacerItem(20, 20, QSizePolicy::Expanding, QSizePolicy::Minimum);        //vLayout1 : vSpacer1 btn1        vLayout1->addSpacerItem(vSpacer1);        vLayout1->addWidget(&btn1);        //hLayout1 : btn2btn3btn4btn5        hLayout1->addWidget(&btn2);        hLayout1->addWidget(&btn3);        hLayout1->addWidget(&btn4);        hLayout1->addWidget(&btn5);        //vLayout2 : vSpacer2 hLayout1(btn2btn3btn4btn5) vSpacer3        vLayout2->addSpacerItem(vSpacer2);        vLayout2->addLayout(hLayout1);        vLayout2->addSpacerItem(vSpacer3);        //hLayout : vLayout1 vLayout2 hSpacer1        hLayout->setSpacing(3);        hLayout->addLayout(vLayout1);        hLayout->addLayout(vLayout2);        hLayout->addSpacerItem(hSpacer1);        hLayout->setContentsMargins(0, 0, 0, 0);        w.setLayout(hLayout);        //w.setLayoutDirection(Qt::RightToLeft);        w.show();        return a.exec();}
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